Notepad accessory for use with a hand tool such as a carpenter's rafter angle square having a generally planar body with an opening between major surfaces on opposite sides of the body. The notepad comprises a pair of generally planar members of greater lateral extent than the opening, a writing surface on one side of each of the generally planar members, and means engagable through the opening for securing the two members together on opposite sides of the body with the writing surfaces facing away from the tool.